ERCELL - I can't speak for Germany but at the tower I work in the UK we have AGI wind measuring systems which measure and display the average wind speed and direction over the preceding 2 minutes. They also display the MAXIMUM and MINIMUM wind speed in the preceding 10 minutes but only if that speed is more than 10kts difference from the 'average'. We are supposed to report it as 'Maximum' or 'Minimum'. 'Gusting' (does that word have an official definition?) to me as a native English speaker implies something happening now, not something nearly 10minutes old...
DD